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Car wont start.
- Thread starter STU3Y
- Start date
Don't worry I didn't take it the wrong way. Fingers crossed I get there eventually. Intermittent faults are always difficult.
So today I had the starter off and stripped it down to see if it could be causing or adding to the hot start issue.
This is what I found.
Valeo starter (was expecting Bosch)
Edge of starter covered in dry dust
Armature rusted all round & Commutator dirty as expected
I cleaned the rust off with wire brush and wool and rubbed the dirt off too.
The thing that concerned me the most was the damage to the lip on the top edge of the commutator (compare it to the other edge)
I greased all the cogs also, wasn't sure what is the correct grease so used white lithium grease.
Anyway put it all back on, definitely starts better and quieter but still hasn't solved the hot start problem completely.
I measured the cranking speed again and came up at 275 and 297 over 2 attempts whilst cold. Didn't actually measure hot yet.
This is what I found.
Valeo starter (was expecting Bosch)
Edge of starter covered in dry dust
Armature rusted all round & Commutator dirty as expected
I cleaned the rust off with wire brush and wool and rubbed the dirt off too.
The thing that concerned me the most was the damage to the lip on the top edge of the commutator (compare it to the other edge)
I greased all the cogs also, wasn't sure what is the correct grease so used white lithium grease.
Anyway put it all back on, definitely starts better and quieter but still hasn't solved the hot start problem completely.
I measured the cranking speed again and came up at 275 and 297 over 2 attempts whilst cold. Didn't actually measure hot yet.
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Scorp
Guest
Hi, I just wanted to say, with my Polo 9N I had a hot starting issue that proved to be a faulty temp render.
Now think this noise is the starter as got under car whilst girlf started it up and seemed to be coming from the starter motor may explain the damage?
Now think this noise is the starter as got under car whilst girlf started it up and seemed to be coming from the starter motor. Might be linked to the damage? Don't know what cause it though.
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So I now have vcds, but I am a complete novice. My car hasnt failed to start for some time now, however has not really been left for longer than 3 days. Still suffering with the hot start issue, fires instantly from cold but takes a few seconds when up to temp.
How do I begin my investigation using vcds? (Idiots versions please!)
How do I begin my investigation using vcds? (Idiots versions please!)
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Any fault codes? Cranking speed when warm? During the few seconds do it attempt to fire up, or just turn over repeatedly and suddenly instantly come to life? Main thing i would be doing is using VCDS to check all of the engine related sensors are reading accurately and as they should, by looking at the data in the measuring blocks
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Also make sure the engine is up to full temp before measuring things.
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
Readings from stone cold are just as useful, it is sometimes the only way to verify if a sensor is accurate. Take temperature sensors, such as the fuel temp sensor. Once the engine is warm, itll be say 60 degrees c. Who's to say thats accurate, it could be 80 degrees c.
Checking readings when the car is stone cold should deliver ambient readings (+ or - a degree or 2) and give you some idea if the sensor is working
Checking readings when the car is stone cold should deliver ambient readings (+ or - a degree or 2) and give you some idea if the sensor is working
Had a few fault codes, 2 were due to aftermarket head unit. One for intermittent interior sensors and the other for immobiliser key signal intermittent. I have managed to clear them all at the moment they haven't come back.
It's doesn't really sound like it struggles just takes a couple of rotations. Not sure if it could be the starter still, based on the bit of rim damage in the photos above. I am waiting for a laptop battery to arrive and will then look through all the measuring blocks.
Do I measure the cranking speed as before. Unplug injector loom and turn over whilst watching rpm on vcds or is their a setting that shows it?
It's doesn't really sound like it struggles just takes a couple of rotations. Not sure if it could be the starter still, based on the bit of rim damage in the photos above. I am waiting for a laptop battery to arrive and will then look through all the measuring blocks.
Do I measure the cranking speed as before. Unplug injector loom and turn over whilst watching rpm on vcds or is their a setting that shows it?
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Some screen shots from vcds, not really sure what the readings should be, however the only one that stands out as being out of place is the bottom photo, block 23 injector switch time deviation. Cylinder 4 is alot lower than all the other for some reason.
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Nothing screaming obvious in there. Injector switch time deviation isn't something i'm familiar with. Is there no max or min rane specified by VCDS? There's some variation, but int he same way you have variation for idle stability/control, where its ranging from -0.75 to + 0.59
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I know the injector balance works like that but not sure about switch deviation. I am a bit stuck I hoped I would be able to figure it out having bought vcds but may have wasted my money. At the moment it still suffering with hot start and on cold start it runs really lumpy for the first 10 secs then settles. There is always a very strong smell of fumes also
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